18934342261 has 2 divisors, whose sum is σ = 18934342262. Its totient is φ = 18934342260.

The previous prime is 18934342253. The next prime is 18934342283. The reversal of 18934342261 is 16224343981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15745481361 + 3188860900 = 125481^2 + 56470^2 .

It is a cyclic number.

It is not a de Polignac number, because 18934342261 - 2³ = 18934342253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18934342201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9467171130 + 9467171131.

It is an arithmetic number, because the mean of its divisors is an integer number (9467171131).

Almost surely, 2^18934342261 is an apocalyptic number.

It is an amenable number.

18934342261 is a deficient number, since it is larger than the sum of its proper divisors (1).

18934342261 is an equidigital number, since it uses as much as digits as its factorization.

18934342261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 43.

The spelling of 18934342261 in words is "eighteen billion, nine hundred thirty-four million, three hundred forty-two thousand, two hundred sixty-one".